Can you draw a Pringle surface?

Yes, the graph of x*y over the unit disk looks a lot like a pringle so we could parameterize that in polar coordinates and use the create_surface function defined in this notebook to draw it: https://observablehq.com/@mcmcclur/parametric-surfaces I've referred to a "pringle" in several posts before is that where the question comes from??

No, I haven't seen your posts that mentioned "pringle" before. Just see the hyperbolic paraboloid above and think that if you could make an intersection with a cylinder in the z direction then it would bound a pringle

Yeah. I don't know if you have a background in applied mathematics at all, but... the hyperbolic paraboloid is the graph of a so-called harmonic function. It can be thought of as a solution to a steady state heat equation in 2D. It appears as the "Relaxed Pringle" under the example menu here: https://observablehq.com/@mcmcclur/illustrations-of-two-dimensonal-heat-flow Also, here: https://math.stackexchange.com/questions/411158/heat-equation-in-polar-co-ordinates/